Best possible solution:

Land the focused plugin-boundary fix once the current-base review and required checks confirm that the resolver and regression test still apply cleanly.

Do we have a high-confidence way to reproduce the issue?

Yes, from the supplied source-level scenario: on Windows, set the three install-root variables to blank values while a standard Chrome executable remains available; the expected result is that screenshotHtml launches that standard browser path rather than probing a relative path.

Is this the best way to solve the issue?

Yes, based on the supplied patch: normalizing optional environment values at the resolver boundary, skipping the invalid local candidate, and retaining documented Windows defaults is narrower and safer than adding configuration or changing Playwright behavior.

AGENTS.md: found and applied where relevant.

Codex review notes: model internal, reasoning high; reviewed against 58452de71188.

Label changes:

• add rating: 🐚 platinum hermit: Overall readiness is 🐚 platinum hermit; proof is 🦞 diamond lobster and patch quality is 🐚 platinum hermit.
• remove rating: 🦐 gold shrimp: Current PR rating is rating: 🐚 platinum hermit, so this older rating label is no longer current.

Label justifications:

• P2: This is a bounded Windows rendering reliability fix with a limited blast radius in the diffs plugin.
• rating: 🐚 platinum hermit: Overall readiness is 🐚 platinum hermit; proof is 🦞 diamond lobster and patch quality is 🐚 platinum hermit.
• status: 👀 ready for maintainer look: ClawSweeper has no concrete contributor-facing blocker left for this PR. Sufficient (live_output): The PR body provides a concrete after-fix Windows production run showing the selected standard Chrome executable and successful PNG rendering under the blank-root conditions; redact equivalent environment and path details in any future attached evidence.
• proof: sufficient: Contributor real behavior proof is sufficient. The PR body provides a concrete after-fix Windows production run showing the selected standard Chrome executable and successful PNG rendering under the blank-root conditions; redact equivalent environment and path details in any future attached evidence.

PR surface:

Source +11, Tests +44. Total +55 across 2 files.

What I checked:

• Changed resolver behavior: The PR changes commonExecutablePathsForPlatform() to treat whitespace-only LOCALAPPDATA, ProgramFiles, and ProgramFiles(x86) values as absent; it omits the local-app-data candidate when absent and retains the two standard Program Files roots. (extensions/diffs/src/browser.ts:521, 81245059e84b)
• Regression coverage: The added test simulates Windows with blank install-root variables, exposes only the standard Chrome path, verifies that Chromium launches with that path, and checks that no relative LOCALAPPDATA candidate is probed. (extensions/diffs/src/browser.test.ts:69, 81245059e84b)
• Real Windows behavior proof: The PR body reports a production PlaywrightDiffScreenshotter run on Windows with blank roots and empty PATH, selecting C:\Program Files\Google\Chrome\Application\chrome.exe and producing a valid PNG. (extensions/diffs/src/browser.ts:521, 81245059e84b)
• Review continuity: The prior ClawSweeper cycle reviewed the same head and found no code-level findings; the subsequent proof update was accepted and the PR now carries proof: sufficient. (extensions/diffs/src/browser.test.ts:69, 81245059e84b)

Likely related people:

• unresolved: The available PR context identifies the proposed change but does not provide enough current-main blame or log evidence to attribute ownership of the existing diffs browser resolver without guessing. (role: current-main history owner not established; confidence: low; files: extensions/diffs/src/browser.ts, extensions/diffs/src/browser.test.ts)

• 🦀 challenger crab: rare, exceptional readiness with strong proof, clean implementation, and convincing validation.
• 🦞 diamond lobster: very strong readiness with only minor maintainer review expected.
• 🐚 platinum hermit: good normal PR, likely mergeable with ordinary maintainer review.
• 🦐 gold shrimp: useful signal, but proof or patch confidence is still limited.
• 🦪 silver shellfish: thin signal; proof, validation, or implementation needs work.
• 🧂 unranked krab: not merge-ready because proof is missing/unusable or there are serious correctness or safety concerns.
• 🌊 off-meta tidepool: rating does not apply to this item.

Shiny media proof means a screenshot, video, or linked artifact directly shows the changed behavior. Runtime, network, CSP, and security claims still need visible diagnostics.

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• reviewed 2026-07-19T06:55:29.953Z sha 8124505 :: needs real behavior proof before merge. :: none
• reviewed 2026-07-19T07:04:01.388Z sha 8124505 :: needs real behavior proof before merge. :: none
• reviewed 2026-07-19T07:12:00.582Z sha 8124505 :: needs maintainer review before merge. :: none